Seasonal Changes in Biomass of Demersal Fish and Benthos Inhabiting the Continental Shelf and the Upper Continental Slope Area of Tosa Bay, Southwestern Japan

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The demersal fish and benthos samplings were carried out by means of bottom trawl net from May 1997 to August 2000 at 13 depth zones from 100m to 1000m deep in the central part of Tosa Bay. The biomass density of a fish species, Chlorophthalmus albatrossis, was high in 200-300m deep, however, that of echinoderms dominated by Linopneustes murrayi was high in 600 to 800m deep as equivalent biomass density to that of C. albatrossis in 300m deep. The results of the investigation on the fauna of the continental shelf and the upper continental slope in Tosa Bay including seasonal changes in the biomass density of the dominant taxonomical groups showed differences in the biomass density and species composition by depth zones and those results suggested that the deep-water fauna was composed by several taxonomical groups and species featured by depth zones.
国立科学博物館の論文